The nile in egypt and the euphrates river in mesopotamia provided rich, fertile soil that allowed civilizations to a. gather berries b. build houses c. hunt animals d. grow crops

the answer is a. since they were a huge producer of cotton and wanted the most money for it.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.